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From:   Pankaj Raghav <p.raghav@samsung.com>
To:     jaegeuk@kernel.org, axboe@kernel.dk, snitzer@kernel.org,
        hch@lst.de, mcgrof@kernel.org, naohiro.aota@wdc.com,
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        linux-fsdevel@vger.kernel.org, matias.bjorling@wdc.com,
        linux-block@vger.kernel.org, Pankaj Raghav <p.raghav@samsung.com>
Subject: [PATCH 15/16] f2fs: ensure only power of 2 zone sizes are allowed
Date:   Wed, 27 Apr 2022 18:02:54 +0200
Message-Id: <20220427160255.300418-16-p.raghav@samsung.com>
In-Reply-To: <20220427160255.300418-1-p.raghav@samsung.com>
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        <CGME20220427160312eucas1p279bcffd97ef83bd3617a38b80d979746@eucas1p2.samsung.com>
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From: Luis Chamberlain <mcgrof@kernel.org>

F2FS zoned support has power of 2 zone size assumption in many places
such as in __f2fs_issue_discard_zone, init_blkz_info. As the power of 2
requirement has been removed from the block layer, explicitly add a
condition in f2fs to allow only power of 2 zone size devices.

This condition will be relaxed once those calculation based on power of
2 is made generic.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
---
 fs/f2fs/super.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index f64761a15df7..db79abf30002 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -3685,6 +3685,10 @@ static int init_blkz_info(struct f2fs_sb_info *sbi, int devi)
 		return 0;
 
 	zone_sectors = bdev_zone_sectors(bdev);
+	if (!is_power_of_2(zone_sectors)) {
+		f2fs_err(sbi, "F2FS does not support non power of 2 zone sizes\n");
+		return -EINVAL;
+	}
 
 	if (sbi->blocks_per_blkz && sbi->blocks_per_blkz !=
 				SECTOR_TO_BLOCK(zone_sectors))
-- 
2.25.1